Abstract: An electrical motor has one or more capacitors inside the motor. Particularly, a half-pitch capacitor induction motor is shown, wherein the stator winding has a plurality of coils, one each on a tooth of the stator, and an auxiliary or capacitor winding includes a plurality of coils, one each on different ones of the teeth of the stator. The stator coils are spaced around the periphery of the stator such that spaces are provided between the coils, and one or more capacitors are provided in such spaces. These capacitors are mounted on an insulator board which provides physical mounting of the capacitors and also provides electrical connection to the capacitors to connect them all in parallel. The capacitors are then connected to the auxiliary winding. By this means, a small-sized motor without an elongated end bell permits mounting the capacitors inside the motor frame instead of outside in the usual cylindrical metal container.

Abstract: A submersible motor is given a relatively short axial length by arranging a member, at the portion which is on the lower end during use, to serve for transmitting radial torque as well as for transmitting thrust load. By such arrangement, the axial length normally required for the thrust bearing and radial bearing is made shorter.

Abstract: An electrical motor operated sump pump has a motor mounted above a centrifugal sump pump. The motor is fully enclosed in a chamber in which the top plate of the pump is the bottom wall. The motor is provided with a casing having air inlet openings in a bottom wall and outlet openings at its top with an upwardly directed internal fan providing a downward flow of air surrounding the casing and inwardly across the top surface of the pump housing, to provide efficient cooling. When the sump water reaches the set limit to operate the pump, the lateral wall of the chamber in which the motor is mounted, this furnishes additional cooling of the circulated air.

Abstract: A submergible motor pump assembly with easy access to any part of the assembly by dismantling minimum elements, i.e. without requiring disassembly of the whole and without requiring discharge of lubricating oil for a mechanical seal. Also, plural balance holes are provided in the main plate of the impeller, and a liner ring is disposed between the main plate and the top wall of the impeller chamber, to establish the flow passage from the tip of the impeller blades through the gap between the main plate and the top wall of the chamber to the balance holes, with flow zones restricted by the liner ring. The five part input power connector includes a tapered rubber boot clamped to a plastic cap in which the terminals are further sealed in place by a resin fill.

Abstract: A new assembly for a capacitor-run submersible motor-pump. The assembly has a built-in starting capacitor and a built-in switch associated with the starting capacitor. A running capacitor is located external to the assembly. With this arrangement, the assembly has only four terminals including a ground terminal connected to the frame of the motor. Thus, a four-conductor cable, i.e. the most commonly used cable, can be used to connect the assembly to an electric distribution panel. The switch is preferably of a centrifugal type triggered at a predetermined speed of the motor to cut the starting capacitor out of the circuit. The assembly is as compact as a conventional capacitor-start motor assembly.

Abstract: A glandless submersible electrical dynamo operative at high temperatures comprising a casing containing a stator and a rotor and a metal alloy filling the space within the casing. The metal alloy is liquid at the operating temperatures of the pump and is an alloy of bismuth, preferably with lead or tin. The bismuth is present in an amount of between 40-60% and the alloy has the property of substantially no volume change upon solidification.

Abstract: A submersible motor is disclosed which is adapted for submersion within an environmental liquid and which has a gas-filled housing having first and second conduits each with proximate and distal ends and communicating with the interior of the housing for permitting ingress of gas into the housing through the first conduit and for discharging gas and accumulated liquid egressing from the housing above the surface of the environmental liquid through the second conduit to provide a visual indication of leakage rate when the first conduit is connected to a source of compressed gas at a pressure in excess of the ambient pressure at the level of submersion of the motor.

Abstract: A submerged electric motor has a molded bracket fitted into a hollow cylindrical molded member for a canned stator to cause an annular sealing member to abut against a radial front end surface connected to a cylindrical surface abutting against that of the molded member and another cylindrical surface connected to the front end surface on the bracket side and against an axial extension of the abutting cylindrical surface and a radial bottom surface connected to each other on the molded member side while a can disposed on the inner surface of the molded member has an extension radially outward bent so as to be sandwiched between the sealing member and the bottom surface.

Abstract: A pressure compensator for a submersible pump has features to prevent damage while lowering the pump into the well. The pressure compensator includes a bellows located below the pump. A retainer will mechanically retain the bellows in a position other than its maximum lubricant volume position while lowering the pump assembly into the well. Once the motor begins operation, the retainer will release the bellows for normal movement. The retainer includes a linkage member that is connected to the top of the bellows and extends upwardly to the drive shaft. A latching device latches the linkage member to the drive shaft. A reverse threaded portion in the latching device unscrews the latching device from the linkage member once the motor begins to rotate.

Abstract: A coupling for electric motors, with each motor comprising a rotor (62, 63) and a stator (60, 61) mounted in a tubular shell (4, 5). The coupling includes the ends (8, 8a) of the tubular shells to be assembled, shaped for end-to-end inter-fitting in a manner which determines a relative angular position of the shells, the shape being identical on both shells; the coupling further including an internal coupling module (12) constituting a subassembly which is independent of the motors per se. The module comprises a coupling sleeve (15) for coupling the rotor shafts (16, 17), electrical connection means (29) for interconnecting the stators (60, 61), and support means acting both as radial bearings (19, 20) and as axial stops (21, 22) for the motors.

Abstract: An induction motor with an improved torque/slip characteristic has a solid rotor having longitudinal grooves running parallel to the axis of rotation which connect with circumferential grooves at each end of the rotor. The rotor is plated with copper so that the grooves are filled with copper. The rotor is then machined over the cylindrical outer surface to produce a solid, non-laminated rotor having high-conductivity paths in the longitudinal grooves connected by high-conductivity short-circuiting rings in the circumferential grooves.In a modification the longitudinal grooves may be skewed. Other high conductivity material may replace copper, for example aluminium.

Abstract: A method for ensuring fluid-tightness is applicable to a submersible motor for operation under conditions of total and permanent immersion, especially in oil wells and geothermal boreholes. The emergent end of the drive shaft of the motor is fitted with a rotary packing-gland. The motor casing is filled with oil which is circulated via an axial duct of the drive shaft, the impulse being produced by a disk pierced by radial ducts. A second circuit constituted by a system of ducts including radial ducts comes into contact with the packing-gland which is at overpressure with respect to the external medium. This results in a controlled leakage flow between the two portions of the packing-gland.

Abstract: A scroll compressor in which depletion of the lubricant supply is prevented both during the normal operation of the compressor and at the time the compressor is started. A motor cover having the form of a bottomed cylinder is provided around a driving motor of the compressor at a position so as to separate the path of suctioned gas which is used for cooling the driving motor from a lubricant return path through which lubricant from the lubricant pool formed at the bottom of the housing of the compressor is pumped to lubricate the bearing frame and returned to the lubricant pool. A check valve may be provided within the motor cover.

Abstract: A transistor (20) is mounted to a plug-in socket (22) and this assembly is in turn attached by a bolted (24) connection to a heat sink (18) which is slidably inserted within a housing (16) open to a bottom side and attached to a vertical tube (10) of an electric outboard motor near the lower unit (6) thereof and has its electrical connections (22d, 22e) with a multiwire conductor (26) sealed (27) in a watertight manner, the conductor extending through an opening (10a) in the sidewall of the tube (10) to the interior of the tube for connection with an upper unit (2) of the motor, the conductor (26) and sidewall opening (10a) also being sealed (28) in a watertight manner.

Abstract: A liquid-seal type motor comprising a cylindrical frame, a stator fixed inside the frame, a can placed at the inner circumferential side of the stator, a pair of end plates placed at both ends of and between the frame and a can to be sealingly connected thereto to thereby form an insulating oil enclosing part in which the stator is confined, a pair of brackets connected to the pair of the end plates respectively and a rotor placed in the can to be journaled by the brackets, a lubricating oil enclosing part being defined by the can, brackets and rotor wherein a flexible pressure adjusting means is placed in the insulating oil enclosing part to sealingly define the interior of the part into two chambers.

Abstract: A liquid-seal type motor comprising a cylindrical frame, a stator fixed inside the frame, a can placed at the inner circumferential side of the stator, a pair of end plates placed at both ends of and between the frame and the can to be sealingly connected thereto to thereby form an insulating oil enclosing part in which the stator is confined, a pair of brackets connected to the pair of the end plates respectively and a rotor placed in the can to be journaled by the brackets. The can, the brackets and the rotor define a lubricating oil enclosing part. A pressure adjusting means has a flexible member for sealingly defines the insulating oil enclosing part into two parts and an oil volume reducing member is provided in the insulating oil enclosing part.

Abstract: A submergible motor for use in a well of water, for example, comprises a motor winding, an insulated power supply conductor for connection to a power supply, an insulated motor conductor connected to the motor winding, and a circuit element electrically connected between the power supply and motor conductors, the circuit element being encased in a molded material in a water-resistant manner and connected to the power supply and/or motor conductors.

Abstract: A rotary electric machine the rated voltage of which is changeable by changing-over the connections of the connection terminals of its armature winding. The connection terminals are classified into those used as power input terminals which are connected directly to AC power supply terminals regardless of the change-over of the rated voltage, and those which are not directly connected to the AC power supply terminals and are selectively connected to one another depending on the desired rate voltage. The former connection terminals used as the power input terminals are connected to the power supply terminals by lead wires, and the latter connection terminals are selectively connected to each other by using jumper conductors. The jumper conductors are held by a jumper conductor holder in a relation electrically insulated from one another. A plurality of such jumper conductor holders are prepared, and a suitable one is selected to deal with the selected power supply voltage driving the rotary electric machine.

Abstract: An oil-filled submersible capacitor-start induction motor for operating a submersible pump includes an integrated capacitor/switch unit releasably secured to the lower end. The motor includes an outer tubular shell with spaced radial rotor bearings and with the housing extending downwardly of the lower bearing to an end bell. A diaphragm unit is secured to the end bell to balance the well pressure and internal oil pressure. The upper end cap includes a three-wire connector to receive a two-wire or a three-wire power cable. The lower end bell is generally cup-shaped and has a three pin connector. The capacitor/switch unit includes a sealed cylindrical housing which fits in the motor end and includes the capacitor and a triac connected to a three-terminal connector including capacitor terminals and a gate terminal. A sealing plug is adapted to be releasably attached to the bottom connector.

Abstract: A submersible pump system comprises a lowermost electrically driven pump unit (4,55) providing an inlet to the system for liquid to be pumped and one or more like pumps (5,55) positioned above it and connected in series. Electric power is supplied to the units by way of conductors within a central pipe (14) concentric with an outer cofferdam pipe (12), dielectric oil being circulated through the conductor pipe and between it and the cofferdam pipe and thus through the pump unit motors which have hollow drive shafts (21) around the conductor pipe. The pump stack may be located within a well casing (52), by sealing rings (62) expanded by the dielectric oil pressure, or surrounded by an outer load-bearing pipe (10). The liquid pumped flows externally of the pump stack and the system can be constructed in separate lengths which can be readily assembled on installation.

Abstract: A submersible electric D.C. motor is provided which has a housing that seals the motor from the surrounding water and holds in a controlled atmosphere which is made to be low in oxygen content and to have free water vapor. Magnetic means are provided to transmit mechanical energy through the housing and liquid means are provided to remove heat from the motor.

Abstract: A motor-driven pump assembly which can be used under water and includes at least an electric motor (1, 2, 3)surmounted by at least one pump (4, 5) connected to the motor drive shaft so as to rotate, wherein the motor is electrically energized by means of an electric connection module (8) fixed to the lower end of the motor (1) beyond the space taken up by the shaft, said module having a connector pin (9) connected to a cable (10) which runs along the assembly and is fixed thereto.

Abstract: A submerged electric motor comprises an outer hollow cylinder formed of a stainless steel, a stator iron core fixed on the inside of the outer cylinder, an annular end plate of a general structural rolled steel welded to an annular end portion formed between the outer hollow cylinder and an inner hollow cylinder coaxial with it by using a welding wire of the stainless steel. A combined deposit metal and fused portion underlaid with the end plate is machined to have an end surface flush with that of the end plate. A bracket is fixed to those end surfaces through bolts. Also a sheet-shaped soft sealing member may be interposed between the bracket and the machined end plate.

Abstract: A reduction gear type D.C. starter motor for an internal combustion engine including a planetary type reduction gear system mounted in a front bracket at a faucet joint portion between it and a rear bracket, the rear bracket and the yoke being integrally formed.

Abstract: An electric motor has features for preventing the bearings from rotating. The motor has a stator mounted in a housing. A rotor is rotated within the stator. The rotor is divided into rotor sections, with bearings spaced between. Each bearing has an outer portion that contains outwardly biased pins. The pins engage slot gaps formed in the stator laminations.

Abstract: In a drilling operation fatique producing vibrational motion is produced in the drill string in the form of longitudinal and torsional load variations at the drill bit and throughout the bottom hole assembly. These load variations occur at least partially as a result of the irregularly shaped hole bottom which develops beneath the bit and which in turn cause the bit to rise and fall with rotation, and the bit loading to vary. In addition, the rotating drill string causes gyrations in the drill string which are transmitted to the bottom end of the drill string and drill bit in the form of load and torque variations. These variations in loading appear as longitudinal and torsional vibrations in the drill string. A dampening and shock absorbing mechanism is at least partially comprised of piezoelectric elements which are responsive to the vibrations of the drill string to produce electrical energy which is used to operate downhole electrical circuits.

Abstract: A charging generator for a motor vehicle comprises two connector housings disposed in diametrically opposite relationship on a bracket of the charging generator, including a single male terminal and a pair of male terminals respectively, a cup-shaped waterproof cover fixed to the bracket to cover a substantial portion, two connector housings disposed on the water-proof cover so as to be fitted into those on the bracket and including a single fitted terminal, and two fitting terminals respectively, the terminals being fitted onto associated male terminals on the bracket.

Abstract: The invention relates to a pumping set for plants carrying water, comprising a split-tube motor and a rotary pump driven by the same, the impeller of which is located on the extremity of the shaft present in the pumping space, said shaft being carried by two radial anti-friction bearings situated at either side of the rotor stack of laminations, and consists of ceramic material at least in the area of these anti-friction bearings and is longitudinally movable with respect to the ceramic bearing rings of the radial anti-friction bearings under forces acting axially on the impeller, the maximum length of this longitudinal displacement being limited by two axial anti-friction bearings. An annular groove is provided in the shaft directly adjacent to each of the two bearing areas of the radial anti-friction bearings, that is to say in each case adjacent the extremity of these bearing areas directed towards the impeller, and that the said distance is smaller than the width of the annular grooves.

Abstract: A submersible pump motor has a bearing that resists rotation with the rotor shaft. The motor has a stator within which a rotor is rotated. The rotor has spaced-apart rotor sections mounted on a shaft. The bearing is stationary and has a cavity in its outer periphery. An elastomeric element is contained in the cavity. The element is of a material that swells upon operation of the motor for frictionally engaging the stator to prevent rotation of the bearing.

Abstract: An electrically powered submersible pump system has a pipe stack in which a dielectric oil is circulated within tubular electric power supply conductors, for which the oil provides insulation, down to the pump head to cool and lubricate the motor bearings. The oil is returned between the conductors and a surrounding cofferdam pipe. The liquid being pumped is guided in a duct between the cofferdam pipe and an outer load bearing pipe. The pipe stack is divisible into sections of convenient length, the conductors, the cofferdam pipe, and the outer pipe having releasable connector means at each end of each pipe stack section.

Abstract: This invention has as its object an electrodynamic machine (10) cooled by a liquid contained in a housing (12) in which is mounted a stator (14) whose inner peripheral wall (16) works with the outer peripheral wall (20) of a rotor mounted to turn in the housing (12) to define between them a gap (22) in which said fluid circulates. The machine according to the invention is characterized in that the peripheral walls (16, 20) are cylindrical and wherein their surface in contact with the cooling liquid is continuous and smooth so as to minimize the energy losses due to the laminar flow of the cooling liquid.Application to the cooling of electrodynamic machines.

Abstract: The stator core having stator coils thereon of a submersible electric motor is provided with a cylindrical can disposed in engagement with the inner surface of the stator coil and molded resin member is formed completely about the external surface of the core, the end surfaces of the core and the end portions of the coils in engagement with the end portions of the can to completely encapsulate the core and coils. The end portions of the can may be bent outwardly and embedded directly in the molded resin member during the molding thereof with the can located within the core. Alternatively, a mold tool may be located within the core for molding the molded resin member about the stator core and coils and upon removal of the tool a hollow cylindrical can may be located within the core. The end portions of the can are then sealed to the end portions of the molded member. A terminal plate and fastener fittings may also be molded integrally into the molded member.

Abstract: A stator of a submerged motor is provided with cylinders formed of carbon fiber reinforced plastics of superhigh precision. To obtain flawless joints between the cylinders of carbon fiber reinforced plastics and the end covers increased wall thickness portions are provided at opposite axial end portions of an inner cylinder near joints of the inner cylinder with the end covers, one increased wall thickness portion being located at one axial end portion on an outer side surface thereof and the other increased wall thickness portion being located at the other axial end portion on an inner side surface thereof. Thus, the inner cylinder has a small wall thickness at an axial central portion to reduce an eddy current loss while its wall thickness is increased at the opposite axial end portions to improve mechanical strength and facilitate joining of the end covers to the inner cylinder.

Abstract: This disclosure pertains to protection apparatus for liquid-filled submergible equipment such as downhole electric motors used in oil wells and the like. The protection apparatus provides a positive bias force on the filling liquid so that any liquid leakage through motor seals and the like takes place from the inside out. The positive bias pressure is created by a piston having a substantially constant biasing pressure applied thereto by constant force springs. The piston operates in a cylinder which communicates at its head-end with the equipment being protected. The base-end of the cylinder communicates with a conventional labyrinth-type protector for maintaining an interface between the protecting liquid and well fluid externally of the cylinder.

Abstract: A motor-pump unit for submerging down a well, e.g. an oil well, comprises a motor portion driving a pump portion. The motor portion is filled with fluid to prevent ingress of the surrounding medium which the pump portion pumps. The fluid is maintained at a higher pressure than the surrounding medium by including a flexible tank filled with fluid and in communication with the fluid in the motor portion. The flexible tank is compressed both by the surrounding medium and by resilient compression means so that the pressure inside the motor is higher than the surrounding pressure, thereby ensuring any leakage is outwardly from the motor. Down the well the temperature rises causing the fluid to expand, so the flexible tank is left substantially empty when the unit is prepared at the surface prior to lowering.

Abstract: A liquid-proofing system for an electric motor, having a casing divided by two partition walls into three coaxially arranged chambers--a top chamber, an intermediate chamber, and a bottom chamber. The partition walls have openings for establishing communication between chambers and for the passage of a shaft interconnecting the shafts of the electric motor and pump. The top chamber is filled with an intermediate liquid, and the lower and the intermediate chambers are filled with the same oil as the oil filling the electric motor. Seals are provided which are formed by rotary and stationary parts and secured to the shaft and partition walls, respectively. The top chamber and the intermediate chamber communicate through pipes directly with the lower part of the bottom chamber, and the seals are installed in the intermediate chamber, the lower part of the bottom chamber and the pipe connecting it to the top chamber being filled with the intermediate liquid.

Abstract: A mold type motor comprises a molded resin frame covering the surfaces of a stator iron core and a coil end and molded resin brackets detachably fitted on the end openings of the molded resin frame wherein a surge absorber unit is embedded in the molded resin frame and is electrically connected to a grounding element.

Abstract: A submersible pump electrical motor has a rotor that is divided into sections, and a bearing located between each of the sections for maintaining the shaft of the rotor in axial alignment. The bearing assembly includes a sleeve that is keyed to the shaft. A bearing has an inner portion that rotatably receives the sleeve. The bearing has a flange with a periphery that frictionally engages the stator to prevent the bearing from rotating. The sleeve physically contacts the adjacent rotor sections and transmits forces between them. Washers are located between upper and lower edges of the bearing inner portion for supporting the bearing. The washers have inner diameters that receive the sleeve, and do not carry the weight of any rotor sections located above.

Abstract: A submersible pump assembly has pressure compensator features to avoid negative pressure at the top of the tool during installation. The submersible pump assembly has an electric motor contained within a lubricant filled motor chamber below a pump. A pressure compensator chamber is located below the motor chamber and separated by a partition. The pressure compensator chamber is also filled with lubricant. A passage bypasses the partition and leads to the motor chamber above the motor. A bellows is mounted in the pressure compensator chamber with its mouth facing upwardly. A port extends from the exterior of the pressure compensator chamber to the interior of the bellows for admitting well fluid. Also, the bellows may be filled with a heavy fluid during installation so as to retard contraction of the bellows if the tool is suddenly jerked to a stop. The bypass passage is not required in this embodiment.

Abstract: A submersible pump electrical motor has a bearing member that is resilient. The submersible pump motor has a stationary stator within which a rotor is rotated. The rotor is divided into sections, with bearings located between each section for maintaining the shaft in alignment. The bearings frictionally engage the stator wall. The bearing has slots extending through its periphery to provide flexibility. The slots incline into the direction of rotation of the shaft to resist rotation of the bearing member.

Abstract: To provide for effective lubrication of a vehicular-type alternator, the bearings (2, 4) positioned at the respective end plates (1, 5) are pressure-lubricated. An oil pressure supply duct (21) is directed towards the rear bearing (4) which is positioned within a chamber (23), the chamber communicating with the central longitudinal bore (24) extending through the shaft towards the drive bearing (2). The drive bearing is positioned within a second chamber (26, 29) and radial bores (25) extend from the central bore (24) in the shaft into the drive side chamber, the drive side chamber being connected to a drain duct 30. To provide communication between the end faces of the bearings, a sickle-shaped recess extends partially circumferentially around the outer race of the respective bearing in the zone of termination of the ducts (21, 30), and having an axial length longer than the respective outer race (34) of the bearing.

Abstract: In a fluid-filled electric motor having a throughgoing shaft the requirements (i) internal fluid pressure maintained above ambient during installation (ii) equalization of internal and ambient pressures at run-up (iii) no solid particles contaminate internal fluid are met by a pressurizing apparatus in which internal motor pressure above ambient moves a piston against a spring. The pressure ensures integrity of a seal and pressure and temperature variations are accommodated by piston movement. The seal runs clear of the motor shaft allowing equalization of internal and ambient pressures during run up to speed. Only liquid can enter the spring chamber.

Abstract: A seal section for a submersible pump assembly has multiple seal chambers, each with an independent bellows. The seal section is located between the motor and the pump, and receives a shaft driven by the motor. At least one partition is located in the seal section, with the shaft sealingly passing through the partition. The partition divides the motor and seal sections into a primary chamber and at least one secondary chamber. A primary bellows is located in the primary chamber. The bellows is in contact with well fluid on one side and lubricant of the pump assembly on the other side for equalizing pressure. A secondary bellows is located in the seal section with one side in contact with the lubricant in the primary chamber and the other side in contact with the lubricant in the secondary chamber. The secondary bellows equalizes the pressures between the two chambers.

Abstract: Generator for production of electrical energy to supply consumers located inside a bore hole, in particular, consumers for detection, transmission and remote control, where the generator is located in a flushing space inside of a drill string through which flushing liquid flows, which includes a stator and a rotor having a radial slot arranged coaxially to the stator and whose rotor is coupled to a motor which is energized by the flushing liquid, characterized by the fact that the stator contains a generator armature and the rotor contains an exciter equipped with a permanent magnet, that said slot between stator and rotor is connected with said flushing space, where a connecting path is directed counter-current to or at an acute angle to the flushing current on the intake side in the region of a branch-off from said flushing space, and that the rotor is supported by means of unsealed, erosion and abrasion-resistant radial and axial bearings.

Abstract: Submersible electric motors for pumping fluid from wells are assembled together in tandem relationship for increasing total output horsepower. Means are provided to make electrical connections just prior to assembly and interconnect the oil flow corridors between motors during assembly. Precompressed spring-loaded thrust bearings compensate for shaft length changes and dampen vibrations. The oil circulation corridors include filtration.

Abstract: A mechanical face seal for a submersible pump has features to prevent it from radial movement due to shaft misalignment. The seal includes an annular stationary face carried by the structure of the pump. A rotating seal member is carried by the shaft and urged into rotating contact with the stationary face. A guide member is mounted to the wall structure and has a portion that slidingly engages the rotating seal member to restrain the rotating seal member from radial movement. The rotating seal member is carried by the shaft independently of radial movement of the shaft.

Abstract: A wet-rotor circulator in accordance with the present invention includes a drive motor coupled to the impeller of a fluid pump. The drive motor includes a rotor assembly enclosed within a fluid impermeable jacket and a stator assembly for driving the rotor. The rotor is coaxially supported within the jacket by bearings which are permanently secured in place by circumferentially crimping sections of the jacket radially inwardly to shape-lock the bearings to the jacket. The crimping takes place during an assembly step in which an applied magnetic field causes substantially instantaneous deformation of the jacket without disturbing the coaxial relationship between the rotor shaft and its support bearings.

Abstract: The invention relates to a low current, low voltage generator for use in an underwater lighting system. The generator is driven by a commercially available source of power, for example, house current. The generator consists of an AC motor having an output shaft and a magnet mounted on the shaft for rotation therewith. A coil arrangement is disposed in a plane parallel with but spaced from the plane of the magnet. The magnet is cylindrical in shape and includes a slot in the front face which faces the coil arrangement. Thus, when the magnet is rotated, it produces an EMF in the coil arrangement to provide a low current low voltage AC output at the output of the coil arrangement, which can be rectified to provide a DC output if required.

Abstract: A molded submersible well motor comprises a hollow cylindrical frame 5 formed of resinous molding material into which a stator assembly having stator cores 2 and coils 3 is molded. End brackets 8 also formed of resinous molding material are detachably secured to opposite ends of the frame to close the openings thereof. A starting switch 12 for the motor is molded into the upper end bracket, together with an interconnecting terminal 9 comprising upper and lower contact posts 91, 92 for connecting the power cable 10 to the stator coils via a connector 6 and an intermediate connector 11, and a sub-receptacle 901, 930 projecting outwardly perpendicular to the main terminal 9 for connection to the starting switch.

Abstract: A hydrodynamic bearing system for a motor. The motor is illustrated and described as driving a pump for an artificial heart. The motor stator has a cylindrical bore which is closed at one end. The rotor is slidable and rotatable in the bore. The rotor has affixed to its shaft an impeller with its outside diameter concentric to the rotor outside diameter. Both rotor and impeller are supported hydrodynamically such that the tendency is for the entire rotor/impeller assembly (the only moving element) to be completely suspended by fluid. The rotor can be rapidly reversed to provide heart pumping action or can be driven unidirectionally for artificial heart pumping action of another type. The fluid cannot easily escape from the closed end of the stator, thereby providing a dashpot effect which tends to keep the rotor from changing position.